Centrifugal machine.



/A. R. ROBERTSON GENTB-IFUGAR MACHINE. APPLIOATION FILED MAY8, 1914.

1,127,284. Patented Feb. 2, 1915.

INVENTUR WITNESSES messes,

To whom it may concern:

i own is l 4 noses; nos e tl n th t l, lu inow r r ERTSON, a subject of the King of Great ain and Ireland, and a resident of Ki: ton, in the city and county of Glasgow, Scotland, have invented certain new i useful Improvements. in Centrifugal 1 chines, of which the following is the spec-7. fication. 1

This invention relates to that class of centrifugal machine used for treating sugar or granular material in which the'discharge of the dried contents is assisted by a basket bottom sloping inwardly at an angle greaterthan the angle of repose of the material.

The invention has for its object to still further facilitate the discharge when the bottom is sloping.

According to the invention the shell of the revolving basket is in the form of the frustum of a cone, smaller end upward, in.- stead of, as usual, being cylindrical.

Baskets having conical shells are known, but the essence of the invention lies in the combination of such a shell with a bottom part sloping at an angle greaterF'than the angle of repose of the material being dried.

In the known construction in which the basket has cylindrical sides and a bottom sloping at an angle greater than the angle of repose of the material being dried, though the material resting upon the sloping and inclined bottom is usually auto matieally discharged when the machine stops, yet it is sometimes the case that the consistency of the material is such that there is sulilcientadhesion of the material to the usual cylindrical sides of the basket to im-' pede discharge. With the truncated eonical shell howeizer, the slightest downward movement of the lower portion of the mate rial on the sloping bottom immediately frees the then unsupported remainder of the terial from the sides of the basket, and gravity causes this portion of the material to at once follow the portion leaving'the sloping bottom. Discharge of the entire contents of the basket is thus insured.

An example of the improved construction of centrifugal basket is shown in vertical section on an accompanying sheet of planatory drawings.

As shown in this drawing, the basket is ofvthe type in which there is an annular discharge opening A, and the bottom B of the Specification of Letters Patent.

an more the dried cov ill not lie on it when the basket is imn'xediately. ell. by their own we. and are clischar o ening A. timiis, it the form of the irustunr cone, smaller end upward, the'jangle sh being about two degrees to the vert This'insures after the material nestl g upon the inclined bottom is discharged, then unsupported remainder of the opposite to and adhering to the shell C the basset will be freed therefrom, and ity will cause this portion of the ma erial to at once follow the portion leaving slop ing bottom 3B it will be ericlent the angle the shell of .t is inclined the vertical. depends on the nature of the is tr ial to he treated. For high grade oly drying sugars enamplo the hown in the drawing is sulliciest inn ower grade sugar or other more i erials the angle to the vertical shoe,u increases bye degrees The basket. is ch d while rnnnir material being fed or to distributing Elli l7, secured on the carrying spindle thrown, against it she-l. G of the H centrifwal force.

What i inn is? In a centrifugal machine, a hasl m l hrough the annular e shell U 15 also inclineto w ich annular discharge opening; in the bottom thereof a bottom at an angle greater than the angle of repose of the material being; dried, cornbination='-tvith a shell for the basket in the form of a frustum of a cone, smaller end upward as described.

2 In a. centrifugal machine, a basket, an annular discharge opening in the bottom thereof, a bottom-at an angle greater angle repose of "he material being dried. in eombinution with a shell the basket the of a frusturn of cone, smaller end upward, the walls of the shell being inclined inwardly from the vertical to such extent that the material being drc-fl ceases to adhere to the shell when one supported from below by reason of the downward movement of the material on the sloping bottom, as described.

In a centrifugal machine, a basket an annular discharge opening in the bottom thereof, a bottom at an angle greater than "i.

the angle of repose of the material being name to this speeification, in the presence dried, in combination with a shell for the of twosubscribing witnesses.

basket in the form of a frustum of a c0ii,, smaller and upward, the ankle to the verti- ANDREW ROBERT ROBERTSON 5 cal 0f the shell being substan'tinlly, two de- Witnesses:

grees, as described; WILFRED HUNT,

In estimony whereof I have signed my JAMES EAGLESOM. 

